Introduction
There was a time when beauty was essentially intuitive: consumers chose a product based on recommendations, texture, or promises. Then came the era of evidence-based dermocosmetics, with clinical instruments measuring hydration, elasticity, and pigmentation in controlled environments. Nowadys, consumers are entering a new stage: the maturity of electronic senses. Optical, biophysical, and environmental sensors, integrated with artificial intelligence, have left the laboratory and are now installed in our phones, smart mirrors, and home devices. Skin and hair are no longer just observed; they are quantified, modeled, and interpreted in real time. The next frontier is digital synesthesia: the ability to correlate human cues – visual, tactile, environmental, and even behavioral – to build a dynamic profile that evolves with us…